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prisoha [69]
3 years ago
10

If a number is positive, then it’s square is positive

Mathematics
2 answers:
8_murik_8 [283]3 years ago
5 0
Yes.
+ x + = +
- x + = -
- x - = +
NNADVOKAT [17]3 years ago
3 0

Answer:

Yes, because of the fact that (+)(+)=+, but (-)(+)=-

Step-by-step explanation:

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Pablo has a busy semester, and he does not want to give too much time to Statistics. So he puts off working through the course,
arsen [322]
Plan an effective strategy for working through the course
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3 years ago
A researcher is going to estimate the average typing speed of students of a college. He selects a random sample of 20 students a
Stella [2.4K]

Answer:

The margin of error of the 90% confidence interval of a student's average typing speed is of 1.933 wpm.

Step-by-step explanation:

We have the standard deviation for the sample, which means that the t-distribution is used to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 20 - 1 = 19

90% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 19 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.9}{2} = 0.95. So we have T = 1.7291

The margin of error is:

M = T\frac{s}{\sqrt{n}}

In which s is the standard deviation of the sample and n is the size of the sample. For this question, we have s = 5, n = 20. So

M = T\frac{s}{\sqrt{n}}

M = 1.7291\frac{5}{\sqrt{20}}

M = 1.933

The margin of error of the 90% confidence interval of a student's average typing speed is of 1.933 wpm.

8 0
3 years ago
Beth filled 32 jars with paint. If each jar holds 1 pint of paint how many gallons of paint did Beth use
Sloan [31]
If there are 8 pints in a gallon there are 4 gallons 32(pints) divided by 8 is 4
3 0
3 years ago
PLEASE HELP ITS ABOUT TO BE DUE
Jlenok [28]

Answer:

x=-1

Step-by-step explanation:

4(x-3(-2))=6(x-3(-2)) => 4(x+6)=6(x+6) => 4x+24=6x+26 => -2=2x => x=-1

6 0
3 years ago
Round to the nearest thousands<br> 3475.6993
Andreyy89

3475.699

°°°°°°°°°°°°°°°

Am I correct?

4 0
3 years ago
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